Flooding occurs when there is not enough oxygen and what else happens?

• A. Fuel accumulates in the combustion area
• B. Fuel is completely burned
• C. Oxygen concentration becomes excessive
• D. There is no flame

Answer: (A)

Flooding happens when the air-fuel mix is too rich because there’s not enough oxygen for proper combustion and fuel accumulates in the combustion area. That excess fuel prevents ignition — the spark may occur, but the mixture is so fuel-heavy that a flame cannot sustain. This is why fuel buildup is the key description of flooding.

The other ideas don’t fit flooding: burning all the fuel would mean the mixture was balanced and ignited, not flooded; having too much oxygen would create a lean mix that is easier to ignite; and while there may be no flame in a flooded condition, the defining problem is the excess fuel in the combustion chamber.